Hi Bjorn,
If the M8.2 and M9 announcements are any guide then if the M9-P is announced now the M10 would be another year away, possibly September '12.
Of course you could get a Sony NEX and start your Leica lens collection now but, having had a brief play with both a NEX-5 and an M9 earlier this year, I wouldn't go down that particular route myself unless somebody made me an offer I couldn't refuse. The ergonomics of the two bodies are chalk and cheese and you can guess which one I'd want to put to my lips...
Bob.